The bipartisan ad is the first one to hit airwaves in the race to succeed U.S. Sen. Bob Corker.

Last month, the campaign for U.S. Rep. Marsha Blackburn, who is seeking the Republican nomination, announced its plan to reserve nearly $1 million worth of ads that will run on TV stations in Tennessee starting in late April.

The ad buys from both campaigns are early indicators that the race be one of the most expensive in state history and one that will draw national attention.

Reach Joel Ebert at jebert@tennessean.com or 615-772-1681 and on Twitter @joelebert29.